[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US4360361A - Coal gasification apparatus - Google Patents

Coal gasification apparatus Download PDF

Info

Publication number
US4360361A
US4360361A US06/257,088 US25708881A US4360361A US 4360361 A US4360361 A US 4360361A US 25708881 A US25708881 A US 25708881A US 4360361 A US4360361 A US 4360361A
Authority
US
United States
Prior art keywords
flow passages
feed holes
cover
tubular wall
vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/257,088
Inventor
Charles K. Nagy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Department of Energy
Original Assignee
US Department of Energy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Department of Energy filed Critical US Department of Energy
Priority to US06/257,088 priority Critical patent/US4360361A/en
Assigned to UNITED STATES OF AMERICA, AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY reassignment UNITED STATES OF AMERICA, AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NAGY, CHARLES K.
Application granted granted Critical
Publication of US4360361A publication Critical patent/US4360361A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/80—Other features with arrangements for preheating the blast or the water vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
    • B01J8/12—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by gravity in a downward flow
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/482—Gasifiers with stationary fluidised bed
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/52—Ash-removing devices
    • C10J3/523—Ash-removing devices for gasifiers with stationary fluidised bed
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/74—Construction of shells or jackets
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/82—Gas withdrawal means
    • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0966—Hydrogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C10J2300/0976—Water as steam
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1656—Conversion of synthesis gas to chemicals
    • C10J2300/1662—Conversion of synthesis gas to chemicals to methane
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams

Definitions

  • Another object of the invention is to arrange flow passages in the wall of a coal hydrogenation reaction vessel so that hydrogen passed through the passages is effectively heated by energy transmitted into the wall by the hydrogenation reaction occurring in the vessel.
  • reaction vessel formed with (1) a vertically disposed tubular casing having a cover attached to the upper end thereof, (2) a coal inlet in said cover, (3) a plurality of flow passages extending vertically through the wall of said casing and circumferentially spaced apart from one another, (4) a plurality of feed holes respectively communicating with said flow passages and the interior of said vessel; and
  • the single FIGURE is a diagrammatic, cross-sectional representation of the preferred apparatus embodiment of the invention, taken along a plane including the longitudinal axis of the hydrogenation reaction vessel thereof.
  • reference number 10 generally designates a coal hydro-gasifier reaction vessel in which hydrogen and steam are contacted with pulverized coal to produce methane.
  • Vessel 10 consists of a vertically disposed, tubular casing 12, the lower portion 14 of which has a reduced diameter and the upper end of which is closed by a cover 16.
  • the lower end of casing 12 is connected to, and communicates with the interior of, a chamber 18 containing an auger tube 20 for discharging the mixture 22 of unreacted coal particles and ash material accumulated therein.
  • Methane passes from chamber 18 through a conduit 24.
  • Pulverized coal enters vessel 10 via an inlet conduit 26 which extends through cover 16 in coaxial relation with casing 12, and preheated water is forced through a conduit 28 to a plurality of nozzles 30 located in the lower portion of the casing, this water flashing to steam as it issues from the nozzles.
  • the wall of vessel 10 is preferably formed of an inner refractory lining, a layer of insulation surrounding the inner lining, and an outer metal shell.
  • a feed conduit 32 delivers hydrogen to an inlet mainfold passage 34 which is formed in the inner lining of the wall of vessel 10 and which extends completely therearound.
  • Spaced apart from one another circumferentially of vessel 10 are a plurality of flow passages 36 which are also formed in the inner lining of the vessel and which connect at their lower ends with inlet mainfold passage 34.
  • a first set of feed holes 38 each of which extends from a respective one of the flow passages 36 to the inner surface of the vessel, the longitudinal axes of these holes lying in a plane disposed perpendicular to the longitudinal axis of said vessel.
  • Sets of three flow passages 36 are joined together above feed holes, and a continuation flow passage 40 extends upward from the junction 42 of the united flow passages of each of these sets.
  • a second set of feed holes 44 is located above junctions 42, and each of these holes extends from a respective one of the flow passages 40 to the inner surface of vessel 10.
  • the longitudinal axes of feed holes 44 also lie in a plane disposed perpendicular to the longitudinal axis of said vessel.
  • Flow passages 40 extend upward to and through cover 16 to the side surface 46 of a recess formed therein.
  • Hydrogen is forced through the above-described system of flow passages 36, 40 by a pump 48 connected to feed conduit 32, this hydrogen being heated by a heat exchanger 50 and a gas fueled furnace 52 located between the pump and vessel 10.
  • the temperature of the hydrogen entering inlet manifold passage 34 and flowing upward through flow passages 36 and 42 is further raised by heat energy transmitted into the wall of casing 12 and cover 16 from the hydrogenation reaction occurring in vessel 10.
  • heat exchanger 50 and furnace 52 Only a portion of the total amount of energy required to heat the hydrogen feed to its hydrogenating temperature is supplied by heat exchanger 50 and furnace 52, and the remainder of this energy is supplied by the hydrogenation reaction itself.
  • the amount of energy saved by the disclosed coal hydrogenation apparatus and process will vary depending upon the operating conditions involved therewith. However, in some coal gasification apparatus, the invention will permit final preheating of hydrogenation from about 1600° F. to 200 ° F. in flow passages 36 and 40, thus conserving the fuel normally required for this heating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

Coal hydrogenation vessel has hydrogen heating passages extending vertically through its wall and opening into its interior.

Description

BACKGROUND OF THE INVENTION
This invention, which results from a contract with the United States Department of Energy, relates to coal hydrogenation.
Commercial processes for the production of synthetic gas involve the reaction of finely divided coal with hydrogen and steam at elevated pressure and at temperatures which can exceed 2500° F. To achieve the desired reaction conditions, the hydrogen required for these processes must be preheated to about 2000° F. A large amount of energy is, of course, used by the heaters which raise hydrogen to the required 2000° F. temperature.
SUMMARY OF THE INVENTION
It is an object of this invention to utilize the heat generated by a coal hydrogenation reaction to provide a portion of the energy required for raising the temperature of hydrogen introduced into the reaction vessel.
Another object of the invention is to arrange flow passages in the wall of a coal hydrogenation reaction vessel so that hydrogen passed through the passages is effectively heated by energy transmitted into the wall by the hydrogenation reaction occurring in the vessel.
These objects are attained by a preferred apparatus embodiment of the invention comprising:
a reaction vessel formed with (1) a vertically disposed tubular casing having a cover attached to the upper end thereof, (2) a coal inlet in said cover, (3) a plurality of flow passages extending vertically through the wall of said casing and circumferentially spaced apart from one another, (4) a plurality of feed holes respectively communicating with said flow passages and the interior of said vessel; and
means for forcing hydrogen through said flow passages and said feed holes into said vessel.
DESCRIPTION OF THE DRAWING
The single FIGURE is a diagrammatic, cross-sectional representation of the preferred apparatus embodiment of the invention, taken along a plane including the longitudinal axis of the hydrogenation reaction vessel thereof.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the drawing, reference number 10 generally designates a coal hydro-gasifier reaction vessel in which hydrogen and steam are contacted with pulverized coal to produce methane. Vessel 10 consists of a vertically disposed, tubular casing 12, the lower portion 14 of which has a reduced diameter and the upper end of which is closed by a cover 16. The lower end of casing 12 is connected to, and communicates with the interior of, a chamber 18 containing an auger tube 20 for discharging the mixture 22 of unreacted coal particles and ash material accumulated therein. Methane passes from chamber 18 through a conduit 24.
Pulverized coal enters vessel 10 via an inlet conduit 26 which extends through cover 16 in coaxial relation with casing 12, and preheated water is forced through a conduit 28 to a plurality of nozzles 30 located in the lower portion of the casing, this water flashing to steam as it issues from the nozzles.
The wall of vessel 10 is preferably formed of an inner refractory lining, a layer of insulation surrounding the inner lining, and an outer metal shell. A feed conduit 32 delivers hydrogen to an inlet mainfold passage 34 which is formed in the inner lining of the wall of vessel 10 and which extends completely therearound. Spaced apart from one another circumferentially of vessel 10 are a plurality of flow passages 36 which are also formed in the inner lining of the vessel and which connect at their lower ends with inlet mainfold passage 34. Located at the middle portion of vessel 10 is a first set of feed holes 38 each of which extends from a respective one of the flow passages 36 to the inner surface of the vessel, the longitudinal axes of these holes lying in a plane disposed perpendicular to the longitudinal axis of said vessel. Sets of three flow passages 36 are joined together above feed holes, and a continuation flow passage 40 extends upward from the junction 42 of the united flow passages of each of these sets. A second set of feed holes 44 is located above junctions 42, and each of these holes extends from a respective one of the flow passages 40 to the inner surface of vessel 10. The longitudinal axes of feed holes 44 also lie in a plane disposed perpendicular to the longitudinal axis of said vessel. Flow passages 40 extend upward to and through cover 16 to the side surface 46 of a recess formed therein.
Hydrogen is forced through the above-described system of flow passages 36, 40 by a pump 48 connected to feed conduit 32, this hydrogen being heated by a heat exchanger 50 and a gas fueled furnace 52 located between the pump and vessel 10. The temperature of the hydrogen entering inlet manifold passage 34 and flowing upward through flow passages 36 and 42 is further raised by heat energy transmitted into the wall of casing 12 and cover 16 from the hydrogenation reaction occurring in vessel 10. Thus only a portion of the total amount of energy required to heat the hydrogen feed to its hydrogenating temperature is supplied by heat exchanger 50 and furnace 52, and the remainder of this energy is supplied by the hydrogenation reaction itself. The amount of energy saved by the disclosed coal hydrogenation apparatus and process will vary depending upon the operating conditions involved therewith. However, in some coal gasification apparatus, the invention will permit final preheating of hydrogenation from about 1600° F. to 200 ° F. in flow passages 36 and 40, thus conserving the fuel normally required for this heating.

Claims (4)

What is claimed is:
1. Coal hydrogenation apparatus comprising:
a reaction vessel having (1) a vertically disposed tubular wall with an upper end and a lower end, the inner surface of said tubular wall circumscribing a reaction chamber, (2) a cover attached to the upper end of said tubular wall, (3) a coal inlet in said cover, (4) a plurality of flow passages located in direct heat transfer relation within said tubular wall and extending vertically from the lower portion thereof toward said cover, said flow passages being circumferentially spaced apart from one another in said tubular wall, and (5) a plurality of feed holes located within said tubular wall and respectively communicating with said flow passages and the interior of said reaction chamber, said plurality of feed holes comprising: a plurality of first feed holes equidistant from said cover; and a plurality of second feed holes equidistant from said cover and located between said cover and said first feed holes, wherein a plurality of said flow passages are joined together within said tubular wall between said first feed holes and said second feed holes; and
means for forcing hydrogen through said flow passages and said feed holes into the interior of said vessel.
2. The apparatus of claim 1 wherein at least some of said flow passages extends into said cover and communciate with the interior of said vessel adjacent said coal inlet.
3. The apparatus of claim 1 including an inlet manifold passage located within the lower portion of said tubular wall and communicating with said flow passages.
4. The apparatus of claim 3 including means for heating said hydrogen before it is forced through said flow passages.
US06/257,088 1981-04-24 1981-04-24 Coal gasification apparatus Expired - Fee Related US4360361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/257,088 US4360361A (en) 1981-04-24 1981-04-24 Coal gasification apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/257,088 US4360361A (en) 1981-04-24 1981-04-24 Coal gasification apparatus

Publications (1)

Publication Number Publication Date
US4360361A true US4360361A (en) 1982-11-23

Family

ID=22974828

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/257,088 Expired - Fee Related US4360361A (en) 1981-04-24 1981-04-24 Coal gasification apparatus

Country Status (1)

Country Link
US (1) US4360361A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US865727A (en) * 1907-08-09 1907-09-10 Augustin L J Queneau Method of making and utilizing gas.
US1738620A (en) * 1926-01-29 1929-12-10 Umpleby Fred Catalytic gas generator
US1849279A (en) * 1926-08-13 1932-03-15 Applic Du Gaz Aux Moteurs S A Gas producer
US2072357A (en) * 1927-06-17 1937-03-02 Hiram J Carson Apparatus for producing water gas
US2175610A (en) * 1936-07-04 1939-10-10 Koppers Co Inc Process and apparatus for the continuous gasification of solid fuels
US2761772A (en) * 1952-05-31 1956-09-04 Texas Co Process for the production of carbon monoxide from a solid fuel
US4142867A (en) * 1974-07-04 1979-03-06 Karl Kiener Apparatus for the production of combustible gas

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US865727A (en) * 1907-08-09 1907-09-10 Augustin L J Queneau Method of making and utilizing gas.
US1738620A (en) * 1926-01-29 1929-12-10 Umpleby Fred Catalytic gas generator
US1849279A (en) * 1926-08-13 1932-03-15 Applic Du Gaz Aux Moteurs S A Gas producer
US2072357A (en) * 1927-06-17 1937-03-02 Hiram J Carson Apparatus for producing water gas
US2175610A (en) * 1936-07-04 1939-10-10 Koppers Co Inc Process and apparatus for the continuous gasification of solid fuels
US2761772A (en) * 1952-05-31 1956-09-04 Texas Co Process for the production of carbon monoxide from a solid fuel
US4142867A (en) * 1974-07-04 1979-03-06 Karl Kiener Apparatus for the production of combustible gas

Similar Documents

Publication Publication Date Title
US8419423B2 (en) Hot air stove
US4460330A (en) Fluidized-bed combustion system
US3194215A (en) Carbon monoxide burner apparatus
CA1074084A (en) Radial-flow reactor for the synthesis of ammonia with production of high-thermal-level steam
US4029054A (en) Waste heat boiler
JPS63135706A (en) Gas burner
US2801158A (en) Method of and apparatus for gasification of pulverized coal
US4465022A (en) Fluidized bed retrofit boiler
US4360361A (en) Coal gasification apparatus
US2644744A (en) Reactor for high-temperature cracking
US2767785A (en) Gas burner
US4192654A (en) Coal gasification plant
US3945806A (en) Reactor-generator
US2723651A (en) Fluid heaters
CA1133462A (en) Heat exchanger for cooling a high pressure gas
US4803957A (en) Gas/liquid heat exchanger
CN214747313U (en) Efficient heat preservation rock wool production is with tail gas energy-saving system that utilizes of curing oven
US3580718A (en) Method for the utilization of hot waste gases from furnaces of metallurgical works
US4323538A (en) Hydrogenation apparatus
CN2232443Y (en) Internal combustion type moving bed dry distillation furnace
Nagy Coal gasification apparatus.[Patent application]
GB2117876A (en) Boilers
US3192905A (en) Combined carbon monoxide oxidizer and fluid heater
CN206666468U (en) Gas generator
US2534090A (en) Pebble heating chamber

Legal Events

Date Code Title Description
AS Assignment

Owner name: UNITED STATES OF AMERICA, AS REPRESENTED BY THE UN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NAGY, CHARLES K.;REEL/FRAME:003903/0142

Effective date: 19810331

Owner name: UNITED STATES OF AMERICA, AS REPRESENTED BY THE UN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAGY, CHARLES K.;REEL/FRAME:003903/0142

Effective date: 19810331

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M170); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19901125